Means for charging storage batteries of telephone systems.



v PATENTED OCT. 30, 1906. T G. MARTIN. Q I MEANS FOR CHARGING STORAGE BATTERIES 0F TELEPHONE SY STEMS,

-APPLICATION FILED F3113. 1905.

' a SHEETS-SEEET 1,

MEANS EOE GHARGIN T. G. MARTIN. G STORAGE BATTERIES 0F TELEPHONE SYSTEMS.

APPLICATION FILED FEB. 3. 1905. .1

PATENTED OCT. 30, '1906.

s SHEETS-SHEET 2.

S QWE'EM fit fm Ne. 834,832., PATBNTED 0on7. 30,1906.

' T. G MARTIN. I MEANS FOR GHARGING STORAGE BATTERIES'OF TELEPHONE SYSTEMS.

APPLICATION FILED FEB. 3.1905.

3 SHBETSSHEET 3.

' resident of Chicago,

UNITED S TES TALBOT G. MARTIN,

,ELECTRlC COMPANY, OF THE LAWS on ILLINOIS;

PATENT? oEFro or CHICAGO, ILLINOIS, ASSIGNOR To AUTOMATIC" CHICAGO, 1LL1NOIS, ORGANIZED UNDER MEANS FQR CHARGING STORAGE BATTERIES OFITELEPHO'NE SYSTEMS.

No. 834,832. I

To all whom it'may concern:

Be it known that I, TAL'B'o'r G. MARTIN, a citizen of theUnited States of America, and a Cook county, Illinois, have invented acertain new and useful Improvement in Means for Charging Storage Batteries of Telephone Systems, of which the following is a specification.

My invention relates to automatic telephone systems in general, but more particularly to autpmatic systems in which the se-' lective switching devices are operated on the step-by j'stepprinciple, and especially to syssubscriber of the other exchange.

terms of this character nhwhich provision is made for trunking between twonrmorelex changes.

Generally stated, the object of my invention is the provision of a simple and eflicient arrangement for charging the tery of one automatic exchange om a source of charging lcu'rrent located at another automatic exc ange,

A special object is the provision of a simple and efficient arrangement whereby the circuit for thus charging the said storage battery may include trunk-line conductor extending between the two automatic exchanges and whereby the said charging-circuit is normally'olosed and the storage battery being charged. during the time that the trunk-line is'not innse, but whereby the said source of chafg-ingecurrent 'is cut ofi and the talking-conductors of the trunk-liner closed as soon as it becomes desirable to use the"- trunk-line as a medium of connection between a subscriber of one exchange and a :It is also an object, of course, to provide certain details and features of-improvement tending to increase the general efliciency and serviceability of a storage-battery-charging arrangement of this particular character.

' To the foregoing and other useful ends and urposes my invention consistsin matters er'einafter set forth and claimed.

In the accompanying drawings, Figure 1 is v a diagram illustrating a trunk-line connection between showing the charging- 50.

two automatic exchanges and battery atone exchange closed, the said battery thereby receiving charging-current from the generator or 2 is a diagrammatic perspec dynamo at the other exchange.

Specification of Letters Patent. Application filed February 3, 1905.. Serial no. 243.050

stora' ebat:

circuit of the storage Patented. oct. 80, 1908.

- tive view of a selector-switch at which the trunk-line terminates in the exchange at the right of the broken line in Fig. 1 and shows the switching device controlled by the switch-shaft for closing the charging-circuit and also opening and closing one side of the said trunk-line. Fig. 3 is a View similar to current-cut off or disconnected from the trunk-line and showing the two normally conductor closed and the trunk-line thereby 1n conditlon for use betweenthe two exchanges. 4

fg nndasshowr is what is usua 1y known as the second selector? A? represented" a repeater at what may be considered a subeiiizhange;

"shownutortheleft' of the dotted line nFlg. 3,) which repeater receive'. electrical impulses from any suitable source," to be' hereinafter "described, and repeats them to the trunk-line connecting thetw'o mentcontrolled by the switchshaft E whereby the battery I at the subexcha'n e may also be charged by the said generator whenever the trunk-line connecting the'two exchanges is idle. I

The interexchange trunk-line iscomposed of two conductors, one of which (the vertical trunk-line conductor 1) terminates at the I 11 lit-hand exchange inthe relav A and in the le t-hand exchange in the condenser H, and the other side, 2, of saidtrunk-lineis normally retained connected with the ener at'orD by the switch -shaft iarm e at-'51 exchange, which retains", the switch -shaft sprin e. and -e switc -shaft'E, however, is operated, the said switch-s e is permitted to leave the rin spring e and engage the spring. 0, at which Fig. 1, but showing the source ofcharging-- n open switch-points in the lower trunk-line I The selector-switch maybe an suitable a I V 'in Fig. 3 the said selector 1s connected with exchanges with the so-called vertical and rotary line-relays A and B ,but energized by 8o from time'to time'flhave devised an arrangee right-hand in contact. When the time the said trunk-line conductor 2 is connected instead to the rotary line-relay B, the

- s ring. a being a terminal of the said relay B.

' heotherend ofsaid, trunk-conductor 2 is under the control-of the relay-lat the subexchange. The said relay controls three termina of the said trunk-conductor, ,2,"

lo forced away from the spring 3' w1th which latter it normally engages, and'brought in contact with the spring ji, whiclrlast s ')ring isfionllecteddirectly to the condenser i The selector I 5 the right of the or main exchange, being of a well-known -type-itwillbe understood that the shaft E,

\ longitudinally disposed in front of the switch,

is provided for the purpose of. extending the,

26 trunk-(:onductorsthatlead to said switch Y through trunk-lineswhich terminate in the -=with other switching apparatus, such as a connector, wherebya final connection may be established with s'omedesired subscribers i line. The'ofl'ice ofthe switch in general is to "connect the trunk-line conduetorsl and 2, 1 respectively, with other'trunk-line, c'onduc-- tom 5 and-6, for example, through the me- 3o dium of the Well-known side switch K. and. t'he line-wipers'7 andS. Said linet-wipersof' courseare-carriedby the shaft .11] and insulated therefrom and fromeach other, Said wipersare adapted engage any :one of a -terminals .that. comprise the hundred ban lin'e ban'k 3. Upon thesame shaft what is known; as ithe 4 private. mountedand insulated; from said shaft,

4;o '-barrk cbntacts Therefore. the apparatus fprovidediin the selectoris -.to operate the v --"switch-sh'aft Ecaiidqthe side switch K to a t a 1 tproperpnsitionrin order'that the desired con- F nest/ion may: bacon plated and. in order that Ti 45 after the saitlwonnec-tion is no longer needed l W be restoredg. townormal position. The side switch is provided, as usual, witlrfoursideswitch-wipers 9*, 10, 11, and 12 and with A- -so; four sets-of contact-points 14,- 15, and 16; 17, I18, and 19;-2'0, 21', and-22; and 23, 24, and 2,5. -Whenever .thevrtical trunk-conductor "1 i I is greunded,*the' vertical line-relay A is ener 'gize'd, and as a result-the verticalma 5 5' energized .in turn, whereby the switch-shaft J is raised one step net L is energizedgands whereby the switchshaft wipers maybe raised. toany one of ten,

: levelsnwhenthe switch-shaft is thus oper- 5 ated, the. sprin which isthe terminal of thearotary tr'un econductor 2, is, disconnected from theaspring e which latter is one of the terminals ot the generator ,D, and; placed;

r 1. in contact with-the spring e, that is,conn ect-- a. 6-5 ed 5 directly to 1 the side-switch q wiper. .12.

' 1 springs j, and j ofwhich-thesecondisythe;

When the relay J is energized, thespr'ing'is provided at the exchangeto dotted' lme in Flgs. 1 and 3,

line and private banks'3; and 4, respectively,

wiper, 9 is also whiclifwiperis adaptedto'engage the private- @111! -=the said 'switch-shattand side switch may,

gnet L is.

each time thesaid magthe vertical and lineq'ela throu h the side-switch \vi )cr 112. a 4 P v The said trunlcomluctor and relay being thus connected, a grounding of the trunk-line 2 will'e'nergize the rotary line-relay B, with the result that the private nurgnet M will also be energized. Alter the said trunk-line is grounded once the ivatc magma, ill is cner gized and deincr d, and as result the side switch K pas r to what is linoun as the second posirion of the side which time the side witch Willi-Yr and 12 leave rho innincl-poin: and .23 and pass into Ollgtlg't'llfl contact-points if 2],

gagemcnt oi the s t wwitch n in grounded contact-point 15 cncrri it; callod rotary magnet N .Kliwcby switch-shal t E is rotated. and I. iwipers brought into contact idle trunk-line in the level to wl raised by the vertical magnet instance, after the vertical magnet raised the shaft two steps, and thereby laced the wipers 7, 8, and J opposite the lirst contact of the second level of their respective banks, and if theiirst nine trunk-lines or" the said second level are busy, the wipers will then be carried by the rotary magnet onto the tenth contact of the second level of their res ective banks which would thrn'ctorc place 1; 1e line-wipers .7 and 8 in contact with ihc vertical and rotary trunk-conducton; 5 end (3 and the private wiper 9 in engimvmmit with the private trunlr-lineZG for \itll hllflwll pin--- poscs. The said trunk-line (.(llNl'lii'lUl'H 5 and 6, it will be evident, are conn 1 suitable manner to the bank coni 28, respectively ductor with the When the wi last busy trun to third positio and 12 then eng cc the contact no ms '1 "i. in. 22, and 25. Thrrcsult of this ltibt/ trove-limit of the side switch is to extend the w rtical and rotary trunk-conductors 1 and 2 through the side switch wipers 11 and lg an'd contactpoints 22 and 25,,respectively,td'tllo verticml and rotary line wipers 7 and 8'} and tine-retortv to the trunk-conduetorsfi and 6, respectively. ,Also aguardingmotential-is established from -theground-tentin-a1'G of the battery 1 to the said -ground-tern1ina'l G, contact -point- 1?), and sideswitch wiper 10 to 't uri'v'atc wiper 9, and therefore to the con-t point 29, for protecting said contact-point and trunk-lino conductors fiandti IOll. furth seizure. Alter a connection isj established If the mink-condnctors l and 2Yaregrou'1 dcd s'i'n.iiliancously ,riita1; vline-relays A and B the diwill then be encrgi zed sinxnltal'ico is y, and, as

I 32 and gized and the switch restored. Referrin to Fig. 3, it willbe'understood that :the si e switch'wiper 30, contact-point 31, and bank-contacts 32, 33; and 34' at the subex'charige correspond to the side-switch wiper 10,'contact-po1nt 19, and line-bank con .tacts 27,28, and 29, respectively, of the switch shown in Fig.2.

is well known, the release-magnet O is enerconnection between the spring f and the con-' ductor 1 and the spring 9 an the conductor 2, "At this same exchange-the stora e battery Lhas its positive terminal groun ed and its negative; term inalconnected with. the

I windingscf the relays f and g-in parallel. 'It

will beseen, furthermore, that the spring is connected with ground. The battery switching relay J, located at the same exchange with,',the' repeater R, has one terminal of its with the negative pole of the coil connected battery I and its other terminal connected with the private-bank contact 34, and therefore-with all other contacts that may be connected in multiple therewith."

; It will beseen-that the condenser at which the line-conductor'l terminates is connected with a bank-contact 33 and with all other contacts connected in in ultiple' therewith. In

a similar-way the condenser 'H, that corres onds to the conductor 2, is connected with t e contact-point 32 and with all other 0011- that'mayb'econnected in multiple. As

liown,.the line relay J not only'con-trols the continuity. of" the charging-circuit, but also that of thetrunk-line conductor 2, as previously stated,--throu h the medium of the prings-j, j, and j he springs and are connected, respectively, with the condenser H andQwith the conductor 2. The spring is connected with the negative pole of the battery Normally the springs 'y"-and- 3' engage each other,and thus maintain the continuity of the connection between the battery I and the conductor 2.- At the subexchange,

. ,besides repeaters, (lilie repeater R,') there are selectors, like, the se ector described in the main exchange; catedto the left of the repeater R by the sideswitch wiper 30, similar to the side-switch wiper '10 of the side switch K, and by three contact-points 31, 36, and 36, similar to the contact-points 19,18, and 17, respectively,

$ the said coma point 31 being grounded I Furthermore, the repeater R, represented di'a' rarnrn atically,

One of saidselectors is indicloses one'of the normally 0 insaid conductor. This re ayJ will remain at the ground terminal G The said sideswitch wiper 30 is retained in third position" andconnected with a wiper 37, similar to the private wiper 9,'which wiper 37 is shown in enga ement with the. private -bank contact 34, w ich is sirrilar to the private bank con' tact 29 of Fig. 2.

The Vertical and rotary line-relays F and G, respectively, are shown connected with bank-contacts 32 and 33, which are similar to the contact-points 27 and 28. The selector S is represented as havin a selected trunk-line of two conductors, similar-to the conductors 5 and 6 in Fig. 2', which terminate in the contact-points 32 and 33. The selective operation of course, it will he. understood, occurs in the manner already described in connection with the selector shown in Fig, 2. It

will be readily understood, however, that the side switch and other apparatus shown at the subexchange may be of any suitable'known or-approved character. Also,- as shown in Fig. 1, the normally closed charging-circuit for the battery I includes the rotary trunkconductor 2 between the two exchanges and includes contacts 7' .and of the relay J and 'contacts'e and e o the main exchange and the generator D.-

In. this way one side" of the trunkline is used for charging the storage battery at one exchange from a source of charging-current at the other exchan e when the'trunk-line is not in use for switc 'n or signaling or talking purposes. The sai trunk-line, with the.

' apparatus illustrated, can of course only be" used in'one directionthat is to say, it can only be used for extending a connection from the subexchange to the main exchange. For example, when the subscriber at-the subexchan e in the course of making a call seizes the selector S the latter selects the repeater R. At the instant that the sideswitch wiper ,30 passes onto the contactpoint 31 the private wiper of said switch will e connected to ground G in the customthus connecting the private wiper 37 to ground and grounding, private-bank contact 34, which it engages at ary way therefore, the

the time. In this way the usual and wellknown guar(lingpotent1ali s established at the private-bank contact 34 and at all multiples thereof, and, in addition, the said private wiper of the calling-switch and the privatc-bs nkcontact 34 are included in a closed circuit including the coil of the relay J, and the battery I. The local but normally open energizing-circuit for the relay J being thus closed, its armature breaks contact between the springs 7" and 1' and closes contact between the springs-j and j. I seen, disconnects the battery I from the trunk-line conductor 2, extending between the same time en switch-points the two exchanges, and at the selector at' This, it will be energizer as long as the selector S is connected with the repeater R. After the selector S has established connection with the repeater R the calling subscriber will of course operate his calling device in'such a manner as to send impulses over his vertical line-conductor and one impulse over his rotary hue-conductor.

I The' ground impulses to the vertical line- F, so that the Said relay conductor will reach the contact-point 32 through a side-switch wi er similar to the side-switch Wiper l1 ofv tile. said switch K and thereby operate the vertical line-relay upon attractingits armature causes thespring to be forced onto the spring 7i, thereby sen ing a ground im pulse, to the, ;vertical line-conductor "1. Grounding his rotary line-conductonwill ground the contact 33,an d therefore the rotary line-relay G in the usual manner. Asa result, the armatureof saidrelayG forces the spring 9 onto the springh, and thereby sends a ground impulse to the rotary trunk-com.

, ductor ,2, since'the relay-springsjand y" are then. in contact.

I Theiground impulseldelivered to the vertical trunloconductor .l-eners grass the, vertical-line relay A, and as a result causes the shaftE to be raised,' The latter upon risingpermits thespringscande to.

come intojcontactaiter the spring rel-leaves. the spring-p The operation of said y last springs disconnects the generator D from the 'trunk line conductor 2 and connects the, saidtrunk-line conductor ,Withthe, rotary line-re 2: being established'aftcr The connection between, said rotary line-relay and said rotarytrunk-conductor the vertical' line-relayA is energized, the ground impulse sent to the rotary trunk-conductor 2 ener izes the,

rotary linerelay B but with the we v4 the trunk-line for switching scribed, the auxiliary charging-circuits will l known. upon the shaft E.- During the use of purposes, as deeffect remain in'the conditlon showni-n Fig. 3.

It will be readily understood that aftera;

connectiorrisestablished the switches may be released inthe usual mal position, as wellas the side-switch wiper 3Q. The fresult is that the switch shaft spring e at the main exchange and the relayspringsj and j? reengage to restore the chargin -circuit, as shown i i-Fig. 1.

. one. automatic ing-current at the atI claim as myinvention-is- 1 Ari-automatic telephone system comprising a trunk-line." extending between-two automatic exchanges, a; storage battery at eluding saidbattery and source :2. an automatic telephone s ,stern com-q prising-e" immense having its en sconnected wit aut atie wane a source or charging cnrrent for said battery,

and well-known manner, at wh ch time the, shaft E is exchange, a source of jch-argother automatic exchange;

anda normally-closed charging-circuit in-; o ent and a conductor-ofsaid trunkdine.

a storagebattery,

' with battery, a trunk-line extending between two exchanges, and a normally closed chargingand a normally closed charging-circuit including the battery and source of current and one conductor of said trunk-line.

3. An automatic telephone system comprising an automatic exc iange provided with astorage battery for furnishing the current necessary for operating the automatic 'apparatus thereof, another exchange provided a source of charging-current for said :circuit including said battery and source of current and a conductor-of said trunk-line.

5. An automatic telephone-system comprising an automatic exchange provided with a storage battery and a battery switching relay, another. exchange provided with a source of charging-current, a trunk-line extending between the two exchanges, and a contacts of said relay. i .6. A- telephone system comprising an automatic exchange provided with a normally closed said battery and including a conductor of charging-circuit including said trunk-line and battery, another exchange, ;a trunk-line'extending between the two exchanges, of charging-current at the said, other ex change, a charging-circuit including said battwo. exchanges, and a normal of said trunk-line,

t'ery and source ofcurrent and-aco'nductor of: said trunk-line, and electromagneticallyoperated means for disconnecting the battery ,from the trunk-line when used for switching,.signaling or talking purposes.

restored to northedatter is to be 7. Atelephonesystem'comprising two exchanges, a trunk-line extending between said exchanges, a storage batteryat one GXClllLtlgr, a source of charging-current at the otherexc g teryand source of current and a conductor a rela for disconnecting the battery from the trun -line when the latter-is to be employed ins ervice between the :ing-ci-rcuit; forlsaid relay, together with private switching-contacts adapted to beincluded in said energizing circuit.

Signedfby me at Chicago, Cook county, Illinois, this-20th dayof January, 1905.

1 2 i": T. G. MARTIN. Witnesses:

source of current and also 1y open energizstorage it SOUIGO a charging-circuit including said bat 

